CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 65,989	$ 57,024
Short-term investments	0	0
Accounts receivable, net	81,795	69,844
Inventories	25,638	25,976
Prepaid expenses and other current assets	23,280	18,931
Total current assets	196,702	171,775
Property and equipment, net	22,321	29,265
Goodwill	240,618	242,827
Intangibles, net	12,817	21,279
Other long-term assets	38,377	42,913
Total assets	510,835	508,059
Current liabilities:
Other debts and capital lease obligations, current	7,175	7,610
Accounts payable	33,778	33,112
Income taxes payable	1,099	233
Deferred revenue	41,592	52,429
Accrued and other current liabilities	52,761	48,705
Total current liabilities	136,405	142,089
Convertible notes, long-term	114,808	108,748
Other debts and capital lease obligations, long-term	12,684	15,336
Income taxes payable, long-term	460	917
Other non-current liabilities	18,228	22,626
Total liabilities	282,585	289,716
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; 87,057 and 82,554 shares issued and outstanding at December 31, 2018 and 2017, respectively	87	83
Additional paid-in capital	2,296,795	2,272,690
Accumulated deficit	(2,067,416)	(2,057,812)
Accumulated other comprehensive income (loss)	(1,216)	3,382
Total stockholders’ equity	228,250	218,343
Total liabilities and stockholders’ equity	$ 510,835	$ 508,059