Patent Finance Obligation - Current and Long-Term Portions of Obligations (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Gross	$ 23,722	$ 29,277
Unamortized Discount	(575)	(1,297)
Net Carrying Amount	23,147	27,980
Current portion	(10,372)	(8,085)
Long term portion of obligation	12,775	19,895
Patent Rights Finance Obligation, Due June 18, 2023 [Member]
Debt Instrument [Line Items]
Gross	14,000	14,000
Unamortized Discount	(185)	(364)
Net Carrying Amount	13,815	13,636
Current portion	(5,129)
Long term portion of obligation	8,685
Patent Finance Obligation, Due August 18, 2018 [Member]
Debt Instrument [Line Items]
Gross	9,722	15,277
Unamortized Discount	(390)	(933)
Net Carrying Amount	9,332	$ 14,344
Current portion	(5,243)
Long term portion of obligation	$ 4,090

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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-SubTopic 10
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-SubTopic 30
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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