CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash	$ 74,910	$ 114,565
Inventory	976
Prepaid expenses and other current assets	4,569	648
Total current assets	80,455	115,213
Property and equipment, net	1,311	786
Right-of-use asset	131	413
Restricted cash	2,178	134
Total assets	84,075	116,546
Current liabilities:
Accounts payable	1,283	1,202
Accrued expenses	7,968	6,606
Lease liabilities	101	397
Current portion of long-term debt	3,333	6,667
Total current liabilities	12,685	14,872
Long-term liabilities:
Long-term debt - less current portion	16,456	11,987
Other long-term liabilities		8
Total long-term liabilities	16,456	11,995
Total liabilities	29,141	26,867
Commitments and Contingencies (Note 11)
Stockholders' equity:
Preferred stock, $0.001 par value; 5,000,000 shares authorized as of September 30, 2018 and December 31, 2017; no shares issued or outstanding as of September 30, 2018 or December 31, 2017
Common stock, $0.001 par value; 120,000,000 shares authorized as of September 30, 2018 and December 31, 2017; 24,645,542 and 24,538,309 shares issued and outstanding as of September 30, 2018 and December 31, 2017, respectively	25	25
Additional paid-in capital	230,799	224,025
Accumulated deficit	(175,890)	(134,371)
Total stockholders' equity	54,934	89,679
Total liabilities and stockholders' equity	$ 84,075	$ 116,546