Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 125,266	$ 147,144
Accounts receivable, net	14,096	13,643
Inventory	6,125	3,484
Prepaid expenses and other current assets	3,418	3,789
Total current assets	148,905	168,060
Property and equipment, net	2,790	3,052
Other assets	1,353	1,538
Total assets	153,048	172,650
Current liabilities:
Accounts payable	3,505	3,625
Accrued expenses and other current liabilities	31,393	32,514
Total current liabilities	34,898	36,139
Long-term debt, net	104,947	74,531
Other liabilities	594	397
Total liabilities	140,439	111,067
Stockholders' equity:
Common stock, $0.001 par value; 200,000,000 shares authorized at June 30, 2020 and December 31, 2019; 45,992,273 and 45,906,162 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	46	46
Additional paid-in capital	495,329	489,565
Accumulated deficit	(482,688)	(427,980)
Accumulated other comprehensive loss	(78)	(48)
Total stockholders' equity	12,609	61,583
Total liabilities and stockholders' equity	$ 153,048	$ 172,650
Shares issued (in shares)	45,992,273	45,906,162