Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2017

Accounting Policies [Abstract]

Summary of allowance for doubtful accounts

	September 30, 2017			December 31, 2016
	(in thousands)
Beginning balance	$	31		$	389
Net allowance adjustments		(20	)		(235	)
Accounts charged off, less recoveries		(4	)		(123	)
Ending balance	$	7		$	31

Schedule of inventories

	September 30, 2017		December 31, 2016
	(in thousands)
Raw materials	$	476	$	3,112
Work-in-process		2,993		4,251
Finished goods		623		637
	$	4,092	$	8,000

Schedule of property and equipment

	September 30, 2017			December 31, 2016
	(in thousands)
Machinery, equipment and tooling	$	6,352		$	17,769
Leasehold improvements		4,624			4,624
Furniture and fixtures		8			699
Information systems		841			991
Construction in progress		247			263
Total cost		12,072			24,346
Accumulated depreciation and amortization		(10,765	)		(17,236	)
Property and equipment, net	$	1,307		$	7,110

Summarizes non-financial assets that were measured and recorded at fair value on non-recurring

	Carrying value at September 30, 2017		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2 )		Significant unobservable inputs (Level 3 )		Loss for nine months ended September 30, 2017
	(in thousands)
Long-lived assets held and used	$	1,307	$	—	$	1,307	$	—	$	675
Long-lived assets held for sale		15,711		—		15,711		—		—
Total nonrecurring for value measurements	$	17,018	$	—	$	17,018	$	—	$	675

	Carrying value at December 31, 2016		Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Significant unobservable inputs (Level 3 )		Loss for twelve months ended December 31, 2016
	(in thousands)
Long-lived assets held and used	$	7,110	$	—	$	7,110	$	—	$	12,264
Long-lived assets held for sale		14,761		—		14,761		—		14,290
Total nonrecurring for value measurements	$	21,871	$	—	$	21,871	$	—	$	26,554

Summary of accumulated comprehensive loss

	September 30, 2017			December 31, 2016
	(in thousands)
Unrealized loss on investments	$	-		$	(12	)
Unrealized loss on currency translation		(10	)		(18	)
Ending balance	$	(10	)	$	(30