Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net (loss) income	$ (9,082)	$ 7,496
Loss from discontinued operations	(12)	(318)
(Loss) income from continuing operations	(9,070)	7,814
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	555	181
Stock-based compensation	1,076	599
Provision for doubtful accounts receivable	9	17
Provision for slow-moving and obsolete inventory	159	1,453
Provision for warranties	110	325
Amortization of loan origination fees	0	47
Loss on dispositions of property and equipment	35	3
Changes in operating assets and liabilities:
Accounts Receivable	5,027	(4,929)
Inventories	(6,444)	(2,569)
Prepaid and other assets	(308)	162
Accounts payable	(3,945)	(1,964)
Accrued and other liabilities	(761)	1,661
Deferred revenue	(93)	(29)
Total adjustments	(4,580)	(5,043)
Net cash (used in) provided by operating activities	(13,650)	2,771
Cash flows from investing activities:
Acquisitions of property and equipment	(1,475)	(540)
Proceeds from the sale of property and equipment	2	0
Net cash used in investing activities	(1,473)	(540)
Cash flows from financing activities:
Proceeds from warrants exercised	0	2,503
Proceeds from issuances of common stock, net	0	23,576
Proceeds from exercises of stock options and employee stock purchase plan purchases	386	255
Repurchases of common stock	(309)	0
Net repayments on credit line borrowings	0	(451)
Net cash provided by financing activities	77	25,883
Effect of exchange rate changes on cash	5	0
Net cash (used in) provided by continuing operations	(15,041)	28,114
Cash flows of discontinued operations:
Operating cash flows, net	(12)	(137)
Investing cash flows, net	0	(446)
Net cash used in discontinued operations	(12)	(583)
Net (decrease) increase in cash and cash equivalents	(15,053)	27,531
Cash and cash equivalents, beginning of period	34,640	7,435
Cash and cash equivalents, end of period	19,587	34,966
Classification of cash and cash equivalents:
Cash and cash equivalents	19,245	34,552
Restricted cash held	342	114
Cash and cash equivalents, end of period	$ 34,640	$ 7,435