Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 129,787	$ 143,940
Short-term investments	88,645	165,250
Accounts receivable, net	46,848	38,354
Inventory	20,842	21,054
Prepaid expenses and other current assets	9,091	7,744
Total current assets	295,213	376,342
Property, plant and equipment, net	55,293	58,147
Operating lease right-of-use assets	15,041	16,523
Other assets	1,139	1,596
Total assets	366,686	452,608
Current liabilities
Accounts payable	4,536	12,770
Accrued expenses and other current liabilities	78,806	65,376
Operating lease liabilities	5,303	5,502
Total current liabilities	88,645	83,648
Convertible notes, net	204,688	188,651
Long-term operating lease liabilities	10,759	12,102
Other non-current liabilities	2,497	1,257
Total liabilities	306,589	285,658
Commitments and contingencies (Note 12)
Stockholders’ equity
Preferred stock, $0.001 par value; 15,000,000 shares authorized as of September 30, 2020 and December 31, 2019; none issued and outstanding	0	0
Common stock, $0.001 par value; 150,000,000 shares authorized as of September 30, 2020 and December 31, 2019; 46,828,333 and 46,464,669 shares issued and outstanding as of September 30, 2020 and December 31, 2019, respectively	47	46
Additional paid-in capital	1,093,026	1,062,996
Accumulated other comprehensive (loss) income	(12)	(92)
Accumulated deficit	(1,032,964)	(896,000)
Total stockholders’ equity	60,097	166,950
Total liabilities and stockholders’ equity	$ 366,686	$ 452,608