Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating activities:
Net loss	$ (18,752,000)	$ (7,317,000)	$ (6,558,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	527,000	522,000	301,000
Gain on sale of fixed asset			(5,000)
Stock-based compensation	1,694,000	1,375,000	907,000
Loss on contract modification	2,126,000
Restricted stock compensation issued to officer		182,000	312,000
Fair Value Adjustment of Warrants	4,117,000	(1,946,000)	(2,700,000)
Loss from change in value of option liabilities	2,613,000
Debt discount amortization			373,000
Changes in operating assets and liabilities:
Trade accounts receivable	(65,000)	53,000	132,000
Inventory	(307,000)	(83,000)
Prepaid expenses and other current assets	96,000	(34,000)	38,000
Other assets	(5,000)		(3,000)
Accounts payable and accrued liabilities	204,000	337,000	(216,000)
Deferred revenue	(64,000)	77,000
Net cash used in operating activities	(7,816,000)	(6,834,000)	(7,419,000)
Investing Activities:
Purchases of property and equipment	(198,000)	(675,000)	(1,061,000)
Decrease (increase) in restricted cash	2,003,000	(2,008,000)
Proceeds from sale of fixed assets			5,000
Investment in patents and trademarks	(22,000)		(9,000)
Net cash provided by (used in) investing activities	1,783,000	(2,683,000)	(1,065,000)
Financing Activities:
Proceeds from (repayment of) short-term debt	(700,000)	700,000
Proceeds from exercise of stock options	206,000	13,000	205,000
Proceeds from exercise of warrants			226,000
Proceeds from stock issuance, net of issuance costs	62,650,000	1,568,000	16,000,000
Net cash provided by financing activities	62,156,000	2,281,000	16,431,000
Net increase (decrease) in cash	56,123,000	(7,236,000)	7,947,000
Cash at beginning of period	2,773,000	10,009,000	2,062,000
Cash at end of period	58,896,000	2,773,000	10,009,000
Supplemental Schedule of Non-Cash Investing and Financing Activities:
Cashless exercise of warrants	665,000
Accrued capital expenditures			$ 5,000