CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Operating activities:
Net loss	$ (13,369)	$ (11,430)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	1,393	1,182
Stock compensation expense	1,973	2,188
Change in fair value of warrants	(99)	(256)
Inventory provision	98	621
Asset retirement obligation	0	(267)
Deferred rent expense	438	0
Tenant improvement reimbursement	898	0
Foreign currency translation loss	17	5
Gain on sales of fixed assets	0	(35)
Changes in operating assets and liabilities:
Inventory	(2,325)	(339)
Accounts receivable	3,048	552
Other current assets	(278)	521
Accounts payable	(2,173)	(899)
Accrued expenses	(205)	(1,109)
Other non-current assets and liabilities, net	0	(43)
Net cash used for operating activities	(10,584)	(9,309)
Investing activities:
Expenditures for property, plant and equipment	(1,314)	(2,330)
Other	0	35
Net cash used in investing activities	(1,314)	(2,295)
Financing activities:
Net proceeds from issuance of common stock	469	11
Deferred financing costs	(244)	0
Borrowings under revolving credit agreement and term loan	8,400	0
Repayments of short-term debt	(2,400)	0
Payments on long-term debt	(28)	(26)
Net cash provided by (used in) financing activities	6,197	(15)
Net decrease in cash	(5,701)	(11,619)
Cash at beginning of period	14,581	30,343
Cash at end of period	8,880	18,724
Supplemental cash flow information
Additions to equipment in process included in accounts payable	36	65
Warrants issued in connection with debt arrangement	190
Interest paid, net of interest capitalized	$ 73	$ 0