Description of Business - Additional Information (Details) $ / shares in Units, $ in Thousands |
1 Months Ended | 12 Months Ended | ||||
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Feb. 28, 2017
USD ($)
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Oct. 31, 2016
$ / shares
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Dec. 31, 2016
USD ($)
$ / shares
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Dec. 31, 2015
USD ($)
$ / shares
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Dec. 31, 2014
USD ($)
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Dec. 31, 2013
USD ($)
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| Description Of Business [Line Items] | ||||||
| Accumulated deficit | $ (1,193,613) | $ (1,140,083) | ||||
| Working capital deficiency | 5,300 | |||||
| Carrying value of the loan | 43,167 | 48,667 | ||||
| Cash and cash equivalents | $ 25,742 | $ 65,767 | $ 78,445 | $ 101,659 | ||
| Reverse stock split, description | In October 2016, the Company’s stockholders voted at a special meeting of stock holders to approve a series of alternate amendments to the Company’s Amended Certificate of Incorporation to effect a reverse stock split of the Company’s issued and outstanding common stock. The Company’s Board of Directors then approved a specific reverse split ratio of 1-for-20. | |||||
| Reverse stock split ratio | 0.05 | |||||
| Common stock, par value per share | $ / shares | $ 0.0075 | $ 0.0075 | $ 0.0075 | |||
| Preferred stock, par value per share | $ / shares | $ 0.05 | $ 0.05 | $ 0.05 | |||
| Subsequent Event [Member] | ||||||
| Description Of Business [Line Items] | ||||||
| Net proceeds from registered direct offering | $ 24,900 | |||||
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Face amount or stated value per share of common stock. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cash inflow from the issuance of common stock, preferred stock, treasury stock, stock options, and other types of equity. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The cumulative amount of the reporting entity's undistributed earnings or deficit. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Description of the reverse stock split arrangement. Also provide the retroactive effect given by the reverse split that occurs after the balance sheet date but before the release of financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Description of business. No definition available.
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- Definition Working capital deficiency. No definition available.
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- Details
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