Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Taxes

Schedule of components of the Company's loss before income taxes

	Year Ended December 31,
	2016		2015		2014
	(In thousands)
Domestic	$	(14,676)	$	(34,276)	$	(25,337)
Foreign		2,138		(28)		1,138
Total loss before income taxes	$	(12,538)	$	(34,304)	$	(24,199)

Schedule of components of the Company's income tax expense (benefit)

	Year Ended December 31,
	2016		2015		2014
	(In thousands)
Current expense (benefit):
Federal	$	18	$	—	$	—
State		67		(15)		40
Foreign		569		566		353
Deferred tax expense (benefit):
Federal		702		(1,494)		—
State		25		(53)		—
Foreign		—		—		—
Total income tax expense (benefit)	$	1,381	$	(996)	$	393

Schedule of reconciliation of income tax expense (benefit) and the amount computed by applying the statutory federal income tax rate

	Year Ended December 31,
	2016		2015		2014
	(In thousands)
Federal tax at statutory rate	$	(4,388)	$	(12,006)	$	(8,470)
Stock-based compensation		867		782		789
Non-deductible meals and entertainment		530		558		531
Net operating losses not used		3,705		10,499		7,478
Tax benefit on available-for-sale securities		702		(1,494)		—
State tax, net of federal benefit		68		(63)		26
Other		(103)		728		39
Total income tax expense (benefit)	$	1,381	$	(996)	$	393

Schedule of significant components of deferred tax assets and liabilities

	December 31,
	2016		2015
	(In thousands)
Deferred tax assets:
Net operating loss carryforwards	$	42,550	$	43,870
Stock-based compensation		12,290		10,850
Research tax credits		17,620		15,220
Fixed assets		1,960		3,440
Capitalized costs		1,310		420
Accrued compensation		6,080		3,580
Other		6,180		4,500
Total deferred tax assets		87,990		81,880
Valuation allowance		(87,990)		(81,880)
Net deferred tax assets	$	—	$	—

Summary of the activity related to unrecognized tax benefits

	Year Ended December 31,
	2016		2015		2014
	(In thousands)
Balance at January 1	$	2,847	$	1,600	$	2,160
Increase (decrease) related to prior year tax positions		(1,076)		927		(907)
Increase related to current year tax positions		307		320		347
Balance at December 31	$	2,078	$	2,847	$	1,600