Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets
Cash and cash equivalents	$ 79,956	$ 151,570
Short-term investments	108,331	88,794
Accounts receivable, net	59,151	56,022
Inventory	30,704	27,059
Prepaid expenses and other current assets	10,876	8,310
Total current assets	289,018	331,755
Property, plant and equipment, net	52,715	54,260
Operating lease right-of-use assets	12,830	14,084
Other assets	965	1,946
Total assets	355,528	402,045
Current liabilities
Accounts payable	7,437	8,826
Accrued expenses and other current liabilities	96,761	90,723
Operating lease liabilities	3,888	4,923
Total current liabilities	108,086	104,472
Convertible notes, net	222,023	210,373
Deferred revenue, non-current	52,829	50,858
Long-term operating lease liabilities	10,031	10,206
Other non-current liabilities	2,173	2,168
Total liabilities	395,142	378,077
Commitments and contingencies (Note 12)
Stockholders’ (deficit) equity
Preferred stock, $0.001 par value; 15,000,000 shares authorized as of June 30, 2021 and December 31, 2020; none issued and outstanding	0	0
Common stock, $0.001 par value; 150,000,000 shares authorized as of June 30, 2021 and December 31, 2020; 46,994,403 and 46,821,644 shares issued and outstanding as of June 30, 2021 and December 31, 2020, respectively	47	47
Additional paid-in capital	1,120,153	1,103,074
Accumulated other comprehensive loss	(61)	(52)
Accumulated deficit	(1,159,753)	(1,079,101)
Total stockholders’ (deficit) equity	(39,614)	23,968
Total liabilities and stockholders’ (deficit) equity	$ 355,528	$ 402,045