Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Summary of income (loss) before income taxes for U.S. and non-U.S. operations

Income (loss) before income taxes for U.S and non-U.S operations was as follows: 

	Year Ended December 31,
	2016			2015			2014
U.S. loss	$	(19,302	)	$	(16,235	)	$	(18,078	)
Non U.S. loss	(264		)	(105		)	(1,842		)
	$	(19,566	)	$	(16,340	)	$	(19,920	)

Schedule of reconciliation of income taxes computed using the federal statutory rate to the taxes reported in consolidated statements of operations

A reconciliation of income taxes computed using the federal statutory rate to the taxes reported in the consolidated statements of operations is as follows: 

	Year Ended December 31,
(In thousands)	2016			2015			2014
Loss before income taxes	$	(19,566	)	$	(16,340	)	$	(19,920	)
Federal statutory rate	34		%	34		%	34		%
Taxes computed at federal statutory rate	(6,652		)	(5,556		)	(6,773		)
State taxes (net of federal benefit)	(1,016		)	(392		)	(463		)
Warrants	—			(118		)	(10		)
Nondeductible stock compensation	549			543			48
State Rate Change	(614		)	—			—
Michigan NOL benefit	—			—			—
Net operating loss expirations	—			—			655
Write-off of Section 382 limited NOL’s	—			—			67,781
Write-off of Section 383 limited R&D credits	—			—			1,600
Other	56			57			352
Adjustment to prior year filed returns	—			(5,203		)	—
Change in valuation allowance	7,677			10,669			(63,190		)
Reported income taxes	$	—		$	—		$	—

Schedule of deferred tax assets

Deferred tax assets consist of the following:

	Year Ended December 31,
(In thousands)	2016			2015
Net operating loss carryforwards	$	10,343		$	13,998
Employee benefits and stock compensation	2,896			2,485
Research and development costs	13,659			4,903
Fixed assets	700			453
Intangible assets	—			(477		)
Inventory reserve	1,898			510
Other, net	196			143
Total deferred tax assets	29,692			22,015
Valuation allowance	(29,692		)	(22,015		)
Net deferred tax assets	$	—		$	—