Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2017

Summary of Significant Accounting Policies [Abstract]

Summary of allowance for doubtful accounts

	March 31, 2017			December 31, 2016
	(in thousands)
Beginning balance	$	31		$	389
Charges to costs and expenses		(24	)		(235	)
Accounts charged off, less recoveries		—			(123	)
Ending balance	$	7		$	31

Schedule of inventories

	March 31, 2017		December 31, 2016
	(in thousands)
Raw materials	$	2,548	$	3,112
Work-in-process		3,743		4,251
Finished goods		936		637
	$	7,227	$	8,000

Schedule of property and equipment

	March 31, 2017			December 31, 2016
	(in thousands)
Machinery, equipment and tooling	$	8,723		$	17,769
Leasehold improvements		4,624			4,624
Information systems		878			991
Furniture and fixtures		260			699
Construction-in-progress		263			263
Total cost		14,748			24,346
Accumulated depreciation and amortization		(12,262	)		(17,236	)
Property and equipment, net	$	2,486		$	7,110

Summary of comprehensive loss

	March 31, 2017			December 31, 2016
	(in thousands)
Unrealized loss on investments (net of taxes)	$	—		$	(12	)
Unrealized loss on currency translation		(8	)		(18	)
Ending balance	$	(8	)	$	(30	)