CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash	$ 196,456	$ 85,449
Accounts receivable, net	4,794	11,563
Inventory	5,272	4,648
Prepaid expenses and other current assets	3,725	3,824
Total current assets	210,247	105,484
Non-current assets:
Property and equipment, net	2,566	2,698
Long-term inventory	3,821	3,778
Right-of-use assets	29,308	29,781
Restricted cash	12,584	12,582
Total assets	258,526	154,323
Current liabilities:
Accounts payable	1,187	2,518
Accrued expenses and other current liabilities	14,711	20,929
Current portion of lease liabilities	1,375	1,327
Total current liabilities	17,273	24,774
Long-term liabilities:
Long-term lease liability - less current portion	28,305	28,673
Long-term debt	71,438	71,184
Total long-term liabilities	99,743	99,857
Total liabilities	117,016	124,631
Commitments and Contingencies (Note 12)
Stockholders' equity:
Common stock, $0.001 par value; 120,000,000 shares authorized as of March 31, 2020 and December 31, 2019; 54,585,636 and 36,086,254 shares issued and outstanding as of March 31, 2020 and December 31, 2019, respectively	55	36
Additional paid-in capital	458,866	325,112
Accumulated deficit	(317,411)	(295,456)
Total stockholders' equity	141,510	29,692
Total liabilities and stockholders' equity	$ 258,526	$ 154,323