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Income Taxes - Summary of Provision for Income Taxes Reconciles to Amount Computed by Applying Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Income Tax Disclosure [Abstract] |  |  |
Federal tax benefit, at statutory rate | $ (17,718) | $ (13,447) | $ (14,732)
State benefit, net of federal benefit | (280) | (1,054) | (922)
Foreign tax rate difference | 222 | 0 | 0
Change in valuation allowance | 15,389 | 11,316 | 15,577
Change in fair value of warrant | 0 | 1,203 | 0
Beneficial conversion feature | 0 | 163 | 0
Research and development credits | (796) | 3 | (1,084)
Share-based compensation | 752 | 2,402 | 2,433
Uncertain tax positions | 0 | (62) | (307)
Change in state apportionment | 2,561 | (347) | (767)
Other | 51 | (53) | (115)
Provision for income taxes | $ 181 | $ 124 | $ 83

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 + Details
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