CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash	$ 97,556	$ 170,898
Accounts receivable, net	7,171
Inventory	5,557	4,095
Prepaid expenses and other current assets	2,202	2,035
Total current assets	112,486	177,028
Noncurrent assets:
Property and equipment, net	2,699	2,166
Long-term inventory	3,000
Right-of-use assets	30,248	29,566
Restricted cash	12,580	12,206
Total assets	161,013	220,966
Current liabilities:
Accounts payable	2,162	5,446
Accrued expenses and other current liabilities	14,555	11,101
Current portion of lease liabilities	1,279	463
Total current liabilities	17,996	17,010
Long-term liabilities:
Long-term lease liability - less current portion	29,026	28,752
Long-term debt	70,935	70,226
Total long-term liabilities	99,961	98,978
Total liabilities	117,957	115,988
Commitments and Contingencies (Note 11)
Stockholders' equity:
Common stock, $0.001 par value; 120,000,000 shares authorized as of September 30, 2019 and December 31, 2018; 34,543,759 and 33,863,077 shares issued and outstanding as of September 30, 2019 and December 31, 2018, respectively	35	34
Additional paid-in capital	316,519	306,053
Accumulated deficit	(273,498)	(201,109)
Total stockholders' equity	43,056	104,978
Total liabilities and stockholders' equity	$ 161,013	$ 220,966