Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 151,570	$ 143,940
Short-term investments	88,794	165,250
Accounts receivable, net	56,022	38,354
Inventory	27,059	21,054
Prepaid expenses and other current assets	8,310	7,744
Total current assets	331,755	376,342
Property, plant and equipment, net	54,260	58,147
Operating lease right-of-use assets	14,084	16,523
Other assets	1,946	1,596
Total assets	402,045	452,608
Current liabilities
Accounts payable	8,826	12,770
Accrued expenses and other current liabilities	90,723	65,376
Operating lease liabilities	4,923	5,502
Total current liabilities	104,472	83,648
Convertible notes, net	210,373	188,651
Deferred revenue, non-current	50,858	0
Long-term operating lease liabilities	10,206	12,102
Other non-current liabilities	2,168	1,257
Total liabilities	378,077	285,658
Commitments and contingencies (Note 14)
Stockholders’ equity
Preferred stock, $0.001 par value; 15,000,000 shares authorized as of December 31, 2020 and December 31, 2019; None issued and outstanding	0	0
Common stock, $0.001 par value; 150,000,000 shares authorized as of December 31, 2020 and December 31, 2019; 46,821,644 and 46,464,669 shares issued and outstanding as of December 31, 2020 and December 31, 2019, respectively	47	46
Additional paid-in capital	1,103,074	1,062,996
Accumulated other comprehensive loss	(52)	(92)
Accumulated deficit	(1,079,101)	(896,000)
Total stockholders’ equity	23,968	166,950
Total liabilities and stockholders’ equity	$ 402,045	$ 452,608