Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 72,778	$ 141,714
Short-term investments, available for sale	451,290	509,199
Accounts receivable	71,964	56,240
Inventory	13,010	10,864
Other current assets	24,150	19,760
Total current assets	633,192	737,777
Restricted cash	5,477	5,477
Property and equipment, net	36,661	33,869
Long-term investments, available for sale	176,689	216,028
Investment in restricted equity securities	56,400	0
Operating lease assets	49,304	0
Total assets	957,723	993,151
Current liabilities:
Accounts payable and accrued liabilities	68,280	86,377
Other current liabilities	3,723	1,856
Total current liabilities	72,003	88,233
Noncurrent operating lease liabilities	67,147	0
Convertible senior notes	393,435	388,496
Other long-term liabilities	15,863	10,231
Deferred rent	0	18,114
Deferred gain on sale of real estate	0	7,312
Total liabilities	548,448	512,386
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value; 220,000 shares authorized; issued and outstanding shares were 91,284 as of March 31, 2019 and 90,797 as of December 31, 2018	91	91
Additional paid-in capital	1,681,244	1,660,361
Accumulated other comprehensive loss	(233)	(1,932)
Accumulated deficit	(1,271,827)	(1,177,755)
Total stockholders’ equity	409,275	480,765
Total liabilities and stockholders’ equity	$ 957,723	$ 993,151