Condensed Consolidated Balance Sheets (unaudited) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 40,604	$ 91,316
Available-for-sale securities	162,380	82,126
Accounts receivable, net	3,412	367
Inventory	3,768	1,704
Prepaid expenses and other current assets	4,815	3,662
Total current assets	214,979	179,175
Property and equipment, net	2,809	3,132
Available-for-sale securities, non-current	53,293	2,991
Prepaid expenses and other non-current assets	5,165	878
Total assets	276,246	186,176
Current liabilities
Accounts payable	7,823	3,878
Accrued liabilities	13,124	12,385
Other current liabilities	735	344
Total current liabilities	21,682	16,607
Long-term debt	111,283	102,647
Other non-current liabilities	721	796
Total liabilities	133,686	120,050
Commitments and Contingencies (Note 7)
Stockholders’ equity
Preferred stock, $0.001 par value — 5,000,000 shares authorized, and zero shares issued and outstanding at June 30, 2018 and December 31, 2017	0	0
Common stock, $0.001 par value — 100,000,000 shares authorized, 27,184,443 and 23,320,551 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	32	28
Additional paid-in capital	423,616	277,964
Accumulated other comprehensive loss	(425)	(167)
Accumulated deficit	(280,663)	(211,699)
Total stockholders’ equity	142,560	66,126
Total liabilities and stockholders’ equity	$ 276,246	$ 186,176