CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 153,225	$ 95,697
Accounts receivable, net	2,129
Inventory	1,316
Prepaid expenses and other current assets	1,905	1,186
Total current assets	158,575	96,883
Property and equipment, net	1,038	738
Intangible assets, net	2,103
Restricted cash	97	97
Other long-term assets	204
Total assets	162,017	97,718
Current liabilities:
Accounts payable	9,106	3,537
Accrued expenses	8,879	2,228
Deferred revenue	4,944
Current portion of term loan payable	2,667	2,667
Total current liabilities	25,596	8,432
Lease incentive obligation	34	68
Term loan payable, long-term	1,479	4,146
Total liabilities	27,109	12,646
Commitments and contingencies (see Note 9)
Shareholders’ equity (deficit):
Preferred stock, $0.001 par value; authorized shares - 5,000,000 at December 31, 2016 and December 31, 2015; issued and outstanding shares - none at December 31, 2016 and December 31, 2015
Common stock, $0.001 par value; authorized shares - 100,000,000 at December 31, 2016 and December 31, 2015; issued and outstanding shares - 29,364,100 at December 31, 2016 and 20,739,351 at December 31, 2015	29	21
Additional paid-in capital	358,063	214,062
Accumulated deficit	(223,184)	(129,008)
Treasury stock		(3)
Total shareholders’ equity	134,908	85,072
Total liabilities and shareholders’ equity	$ 162,017	$ 97,718