CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 107,611	$ 153,225
Accounts receivable	5,823	2,129
Inventory	1,401	1,316
Prepaid expenses and other current assets	4,061	1,905
Total current assets	118,896	158,575
Property and equipment, net	1,632	1,038
Intangible assets, net	1,877	2,103
Restricted cash	97	97
Other long-term assets	171	204
Total assets	122,673	162,017
Current liabilities:
Accounts payable	4,982	9,106
Accrued expenses	19,268	8,879
Deferred revenue		4,944
Current portion of term loan payable	2,146	2,667
Total current liabilities	26,396	25,596
Lease incentive obligation	8	34
Term loan payable, long-term		1,479
Total liabilities	26,404	27,109
Commitments and contingencies (see Note 10)
Shareholders' equity:
Preferred stock, $0.001 par value; authorized shares - 5,000,000 at September 30, 2017 and December 31, 2016; issued and outstanding shares - none at September 30, 2017 and December 31, 2016
Common stock, $0.001 par value; authorized shares - 100,000,000 at September 30, 2017 and December 31, 2016; issued and outstanding shares - 30,765,100 at September 30, 2017 and 29,364,100 at December 31, 2016	31	29
Additional paid-in capital	376,884	358,063
Accumulated deficit	(280,646)	(223,184)
Total shareholders' equity	96,269	134,908
Total liabilities and shareholders' equity	$ 122,673	$ 162,017