CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 126,190	$ 73,032
Short-term investments	26,604	31,847
Accounts receivable, net	69,515	74,144
Inventories	38,819	32,747
Deferred tax assets, short-term	0	3,375
Prepaid expenses and other current assets	25,003	17,539
Total current assets	286,131	232,684
Property and equipment, net	27,012	27,221
Goodwill	197,781	197,884
Intangibles, net	4,097	10,599
Other assets	9,936	12,130
Total assets	524,957	480,518
Current liabilities:
Accounts payable	19,364	15,318
Income taxes payable	307	893
Deferred revenue	33,856	38,601
Accrued liabilities	31,354	35,118
Total current liabilities	84,881	89,930
Convertible debt, long-term	98,295	0
Income taxes payable, long-term	3,886	4,969
Deferred tax liabilities, long-term	0	3,095
Other non-current liabilities	9,727	10,711
Total liabilities	$ 196,789	$ 108,705
Commitments and contingencies (Note 18)
Stockholders’ equity:
Preferred stock, $0.001 par value, 5,000 shares authorized; no shares issued or outstanding	$ 0	$ 0
Common stock, $0.001 par value, 150,000 shares authorized; 76,015 and 87,700 shares issued and outstanding at December 31, 2015 and 2014, respectively	76	88
Additional paid-in capital	2,236,418	2,261,952
Accumulated deficit	(1,903,908)	(1,888,247)
Accumulated other comprehensive loss	(4,418)	(1,980)
Total stockholders’ equity	328,168	371,813
Total liabilities and stockholders’ equity	$ 524,957	$ 480,518