Income Taxes - Summary of Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	[1],[2]	$ 34,287	$ 33,783
Credit carryforwards	[1]	6,492	5,693
Depreciation and amortization			594
Capitalized research and development		6,992	8,164
Deferred rent		1,825	223
Allowances		767	261
Deferred compensation		1,209	760
Deferred revenue		331	253
Stock compensation	[2]	220	323
Deferred tax assets		52,123	50,054
Less: Valuation Allowance		(50,959)	(50,054)
Net deferred tax assets		1,164
Deferred Tax Liability:
Goodwill		(766)	(676)
Depreciation and Amortization		(1,164)
Deferred tax liabilities		(1,930)	(676)
Net deferred tax liability		$ (766)	$ (676)

[1] Carryforwards are presented net of associated tax contingencies

[2] During the current period, we recorded an increase to the NOL and an increase to the valuation allowance of $727,000 as a result of the adoption of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting."