CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net loss	$ (14,200,000)	$ (15,074,000)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	505,000	542,000
Amortization of intangible assets	3,000	3,000
Amortization of investment discount	121,000	37,000
Equity-based compensation	3,215,000	1,686,000
(Increase) decrease in assets:
Accounts receivable	(522,000)	0
Inventory	(4,155,000)	0
Prepaid expense and other	(457,000)	(518,000)
Other current assets	(280,000)	(1,212,000)
Increase (decrease) in liabilities:
Accounts payable	276,000	494,000
Accrued liabilities	(4,000)	906,000
Deferred revenue and income	29,000	(69,000)
Net cash used in operating activities	(15,469,000)	(13,205,000)
Cash flows from investing activities:
Purchases of equipment	(229,000)	(1,681,000)
Purchases of available-for-sale securities	(4,562,000)	(36,718,000)
Sales of available-for-sale securities	0	500,000
Maturity of available-for-sale securities	8,845,000	3,400,000
Net cash provided (used) in investing activities	4,054,000	(34,499,000)
Cash flows from financing activities:
Issuance of common stocks	189,000	0
Exercise of options and warrants	1,844,000	28,000
Common stock issuance costs	0	(814,000)
Payments on capital lease obligations	0	(13,000)
Net cash provided (used) by financing activities	2,033,000	(799,000)
Effect of exchange rate on cash:	55,000	(49,000)
Decrease in cash and cash equivalents	(9,327,000)	(48,552,000)
Cash and cash equivalents, beginning of period	19,244,000	120,585,000
Cash and cash equivalents, end of period	$ 9,917,000	$ 72,033,000