CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities:
Net loss	$ (30,657)	$ (32,940)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	1,045	1,147
Amortization of intangible assets	6	5
Amortization of investment discount	219	123
Equity-based compensation	7,450	3,921
Loss on disposal of property & equipment	5	0
(Increase) decrease in assets:
Accounts receivable	(648)	(92)
Inventory	(5,537)	0
Prepaid expense and other	(624)	272
Other current assets	(313)	(1,220)
Increase (decrease) in liabilities:
Accounts payable	528	(394)
Accrued liabilities	392	1,175
Deferred revenue and income	43	(84)
Net cash used in operating activities	(28,091)	(28,087)
Cash flows from investing activities:
Purchases of equipment	(1,643)	(2,084)
Purchases of available-for-sale securities	(39,342)	(63,534)
Sales of available-for-sale securities	6,522	1,000
Maturity of available-for-sale securities	18,449	9,380
Net cash used in investing activities	(16,014)	(55,238)
Cash flows from financing activities:
Issuance of common stock net issuance costs	83,854	0
Exercise of options and warrants	3,418	95
Common stock issuance costs	0	(814)
Payments on capital lease obligations	0	(13)
Recovery of related party short-swing profits	0	991
Net cash provided by financing activities	87,272	259
Effect of exchange rate on cash:	198	0
Increase (decrease) in cash and cash equivalents	43,365	(83,066)
Cash and cash equivalents, beginning of period	19,244	120,585
Cash and cash equivalents, end of period	$ 62,609	$ 37,519