Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash and cash equivalents	$ 151,299	$ 143,940
Short-term investments	90,619	165,250
Accounts receivable, net	43,078	38,354
Inventory	19,092	21,054
Prepaid expenses and other current assets	8,991	7,744
Total current assets	313,079	376,342
Property, plant and equipment, net	56,177	58,147
Operating lease right-of-use assets	14,906	16,523
Other assets	1,093	1,596
Total assets	385,255	452,608
Current liabilities
Accounts payable	6,661	12,770
Accrued expenses and other current liabilities	71,886	65,376
Operating lease liabilities	5,314	5,502
Total current liabilities	83,861	83,648
Convertible notes, net	199,157	188,651
Long-term operating lease liabilities	10,501	12,102
Other non-current liabilities	1,924	1,257
Total liabilities	295,443	285,658
Commitments and contingencies (Note 12)
Stockholders’ equity
Preferred stock, $0.001 par value; 15,000,000 shares authorized as of June 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 June 30, 2020 and December 31, 2019; 46,513,349 and 46,464,669 shares issued and outstanding as of June 30, 2020 and December 31, 2019, respectively	47	46
Additional paid-in capital	1,082,964	1,062,996
Accumulated other comprehensive income (loss)	117	(92)
Accumulated deficit	(993,316)	(896,000)
Total stockholders’ equity	89,812	166,950
Total liabilities and stockholders’ equity	$ 385,255	$ 452,608