CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 261,436	$ 161,833
Accounts receivable, net	18,204	20,562
Inventories, net	26,851	26,519
Available-for-sale securities		134,826
Prepaid research and development expenses	1,832	3,881
Other current assets	14,515	18,847
Total current assets	322,838	366,468
Inventories	106,337	98,053
Deposit on inventory		12,350
Property and equipment, net	13,412	15,287
Right-of-use assets, net	32,363	28,141
Intangible assets, net	68,428	62,920
Goodwill	63,074	63,074
Other assets	21,757	23,311
Total assets	628,209	669,604
Current liabilities:
Accounts payable	24,287	32,237
Accrued research and development expenses	45,587	53,214
Lease liabilities	5,028	5,405
Other accrued expenses	37,682	42,228
Total current liabilities	112,584	133,084
Long-term lease liabilities - less current portion	33,786	29,479
Convertible senior notes	504,680	644,751
Borrowings under financing agreement	72,459	34,991
Other long-term liabilities	2,075	1,556
Total liabilities	725,584	843,861
Commitments and contingencies (Note 15)
Stockholders' equity:
Preferred stock, par value $0.001 per share; 10,000,000 shares authorized, no shares issued and outstanding at June 30, 2020 and December 31, 2019
Common stock, $0.001 par value per share, 200,000,000 shares authorized at June 30, 2020 and December 31, 2019, respectively; 88,196,705 and 54,956,341 shares issued and outstanding at June 30, 2020 and December 31, 2019, respectively	88	55
Additional paid-in capital	2,382,544	2,114,068
Accumulated other comprehensive loss	(44,913)	(44,865)
Accumulated deficit	(2,435,094)	(2,243,515)
Total stockholders' deficit	(97,375)	(174,257)
Total liabilities and stockholders' equity (deficit)	$ 628,209	$ 669,604