Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2016

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Available-for-Sale Securities Recorded at Fair Value with Unrealized Gains or Losses

Available-for-sale securities with contractual maturities of less than 12 months were as follows (in thousands):

	December 31, 2016						December 31, 2015
	Amortized		Gross		Fair		Amortized		Gross			Fair
	cost basis		unrealizedloss		value		cost basis		unrealized loss			value
Corporate bonds and notes	$	—	$	—	$	—	$	—	$	—		$	—
Government securities/money    market		—		—		—		4,080		(2	)		4,078
Total	$	—	$	—	$	—	$	4,080	$	(2	)	$	4,078

Summary of Equipment and Improvements

Equipment and improvements consist of the following (in thousands):

	December 31,
	2016			2015
Computer hardware, software, and equipment	$	14,617		$	16,288
Leasehold improvements		5,315			5,170
Office furniture and fixtures		1,073			1,214
		21,005			22,672
Less accumulated depreciation and amortization		(19,194	)		(20,180	)
Equipment and improvements, net	$	1,811		$	2,492

Schedule of Acquired Intangible Assets by Major Asset Class

The following table sets forth our acquired intangible assets by major asset class as of December 31, 2016 and December 31, 2015 (in thousands except for useful life data):

		December 31, 2016												December 31, 2015
	Useful life			Accumulated			Net book value		Impairment			Net				Accumulated		Net
	(years)	Gross		amortization			before impairment		charge			book value		Gross		amortization		book value
Purchased    technology	5 -6	$	265	$	(32	)	$	233	$	—		$	233	$	—	$	—	$	—
Customer    relationships	3-6		999		(147	)		852		(411	)		441		—		—		—
Trademarks/trade    names	2		38		(9	)		29		—			29		—		—		—
Non-compete	3		51		(9	)		42		—			42		—		—		—
Total		$	1,353	$	(197	)	$	1,156	$	(411	)	$	745	$	—	$	—	$	—

Future Amortization Expense Related to Intangible Assets

Future amortization expense related to intangible assets as of December 31, 2016 are as follows (in thousands):

Year Ending December 31,
2017		259
2018		249
2019		143
2020		46
2021		40
Beyond		8
Total	$	745

Summary of Accrued Short-term Liabilities

Accrued short-term liabilities consist of the following (in thousands):

	December 31,
	2016		2015
Salaries and benefits	$	2,545	$	2,723
Restructuring liabilities		485		442
Pennsylvania grant liability		65		1,000
Royalties and revenue sharing		146		643
Income & other taxes payable		56		205
Interest payable		97		—
Marketing expenses, rebates, and other		109		51
Total accrued short-term liabilities	$	3,503	$	5,064

Deferred Rent and Other Long Term Liabilities

Deferred rent and other long-term liabilities consist of the following (in thousands):

	December 31,
	2016		2015
Deferred rent	$	1,162	$	1,402
Restructuring liabilities		1,475		1,767
Pennsylvania grant liability		267		—
Sublease deposits		66		66
Total deferred rent and other long-term liabilities	$	2,970	$	3,235