CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net loss	$ (16,340)	$ (19,920)	$ (15,622)
Adjustments to reconcile net loss to net cash used for operating activities:
Depreciation and amortization	1,592	752	489
Stock compensation expense	2,747	839	926
Inventory provision	627	0	0
Change in fair value of warrants	(324)	27	(5,337)
Bargain purchase gain	0	(3,473)	0
Foreign currency translation loss (gain)	67	(152)	0
(Gain) loss on sale of fixed assets	(35)	139	0
Write down of asset retirement obligation	(268)	(1,102)	0
Changes in operating assets and liabilities:
Inventory	(86)	119	0
Accounts receivable	(2,728)	(8,139)	0
Other current assets	572	(455)	(65)
Accounts payable	1,726	2,773	(571)
Accrued expenses	(764)	3,007	237
Asset retirement obligation	(80)	0	0
Other non-current assets and liabilities, net	(52)	175	0
Net cash used for operating activities	(13,346)	(25,410)	(19,943)
Investing activities:
Acquisition of CTRM business, net of cash acquired	0	(1,450)	0
Expenditures for property, plant and equipment	(2,427)	(829)	(40)
Other	35	101	0
Net cash used for investing activities	(2,392)	(2,178)	(40)
Financing activities:
Net proceeds from issuance of common stock and warrants	11	49,934	14,438
Payments on long-term debt	(35)	(8)	(34)
Net cash provided by financing activities	(24)	49,926	14,404
Effect of exchange rate changes on cash	0	(54)	0
Net increase (decrease) in cash	(15,762)	22,284	(5,579)
Cash at beginning of period	30,343	8,059	13,638
Cash at end of period	14,581	30,343	8,059
Supplemental cash flow information (non-cash):
Acquisition of business through promissory note	0	2,500	0
Accretion of convertible preferred stock	0	0	1,263
Common shares exchanged for preferred stock	3,150	0	0
Warrants exchanged for common stock	0	965	0
Additions to equipment in process included in accounts payable	42	199	0
Equipment acquired under capital lease	$ 0	$ 153	$ 0