CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net loss	$ (19,566)	$ (16,340)	$ (19,920)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	1,886	1,592	752
Loss on impairment of intangible asset	2,638	0	0
Stock compensation expense	2,499	2,747	839
Inventory provision	137	627	0
Change in fair value of warrants	0	(324)	27
Bargain purchase gain	0	0	3,473
Foreign currency translation loss (gain)	5	67	(152)
(Gain) loss on sale of fixed assets	0	(35)	139
Deferred rent expense	670	0	0
Write down of asset retirement obligation	0	(268)	(1,102)
Changes in operating assets and liabilities:
Inventory	(2,245)	(86)	119
Tenant improvement reimbursement	898	0	0
Accounts receivable	(6,174)	(2,728)	(8,139)
Other current assets	(701)	572	(455)
Accounts payable	(1,076)	1,726	2,773
Accrued expenses	920	(764)	3,007
Asset retirement obligation	185	(80)	0
Other non-current assets and liabilities, net	32	(52)	175
Net cash used for operating activities	(19,892)	(13,346)	(25,410)
Investing activities:
Acquisition of CTRM business, net of cash acquired	0	0	(1,450)
Expenditures for property, plant and equipment	(1,415)	(2,427)	(829)
Other	0	35	101
Net cash used for investing activities	(1,415)	(2,392)	(2,178)
Financing activities:
Net proceeds from issuance of common stock and warrants	19,455	11	49,934
Financing costs paid	(213)	0	0
Borrowings under revolving and term loan credit agreements	12,900	0	0
Payments on term loan credit agreement	(2,400)	0	0
Payments on long-term debt	(38)	(35)	(8)
Net cash provided by (used in) financing activities	29,704	(24)	49,926
Effect of exchange rate changes on cash	0	0	(54)
Net increase (decrease) in cash	8,397	(15,762)	22,284
Cash at beginning of period	14,581	30,343	8,059
Cash at end of period	22,978	14,581	30,343
Supplemental cash flow information (non-cash):
Acquisition of business through promissory note	0	0	2,500
Shares exchanged between common and preferred stock	(3,150)	3,150	0
Warrants exchanged for common stock	0	0	965
Additions to equipment in process included in accounts payable	18	42	199
Equipment acquired under capital lease	0	0	153
Interest paid, net of interest capitalized	226	0	0
Warrants issued in connection with debt arrangement	$ 190	$ 0	$ 0