CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 118,697	$ 153,225
Accounts receivable	9,969	2,129
Inventory	1,813	1,316
Prepaid expenses and other current assets	3,005	1,905
Total current assets	133,484	158,575
Property and equipment, net	1,826	1,038
Intangible assets, net	0	2,103
Restricted cash	97	97
Other long-term assets	161	204
Total assets	135,568	162,017
Current liabilities
Accounts payable	5,684	9,106
Accrued expenses	8,541	8,879
Accrued rebates, returns and discounts	15,784
Deferred revenue		4,944
Current portion of deferred rent and lease note payable	1,479	2,667
Total current liabilities	31,488	25,596
Lease incentive obligation		34
Term loan payable, long-term		1,479
Total liabilities	31,488	27,109
Commitments and contingencies (see Note 9)
Shareholders' equity:
Preferred stock, $0.001 par value; authorized shares - 5,000,000 at December 31, 2017 and December 31, 2016; issued and outstanding shares - none at December 31, 2017 and December 31, 2016
Common stock, $0.001 par value; authorized shares - 100,000,000 at December 31, 2017 and December 31, 2016; issued and outstanding shares - 32,770,678 at December 31, 2017 and 29,364,100 at December 31, 2016	33	29
Additional paid-in capital	402,096	358,063
Accumulated deficit	(298,049)	(223,184)
Total shareholders' equity	104,080	134,908
Total liabilities and shareholders' equity	$ 135,568	$ 162,017