CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 132,991	$ 84,685
Short-term investments	722,718	580,538
Contracts receivable	50,615	108,043
Inventories	6,504	7,489
Other current assets	51,531	17,177
Total current assets	964,359	797,932
Property, plant and equipment, net	99,677	92,845
Patents, net	21,362	20,365
Deposits and other assets	5,433	1,325
Total assets	1,090,831	912,467
Current liabilities:
Accounts payable	13,268	21,120
Accrued compensation	10,298	24,186
Accrued liabilities	35,878	36,013
Current portion of long-term obligations	21,476	1,185
Current portion of deferred contract revenue	110,840	51,280
Total current liabilities	191,760	133,784
Long-term deferred contract revenue	100,843	91,198
1 percent convertible senior notes	516,539	500,511
Long-term obligations, less current portion	15,095	15,050
Long-term financing liability for leased facility	51,023	72,359
Total liabilities	875,260	812,902
Stockholders' equity:
Common stock, $0.001 par value; 300,000,000 shares authorized, 124,146,356 and 120,351,480 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	124	122
Additional paid-in capital	1,434,986	1,311,229
Accumulated other comprehensive loss	(30,372)	(30,358)
Accumulated deficit	(1,189,167)	(1,181,428)
Total stockholders' equity	215,571	99,565
Total liabilities and stockholders' equity	$ 1,090,831	$ 912,467