CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 57,706	$ 57,128
Accounts receivable, net	50,826	50,862
Inventories—short-term portion	57,506	58,059
Deferred tax assets—short-term portion	1,222	767
Prepaid expenses and other current assets	6,882	8,920
Total current assets	174,142	175,736
Property and equipment, net	16,969	18,671
Inventories—long-term portion	5,865	5,972
Goodwill	161,548	161,595
Intangible assets, net	125,530	131,108
Deferred tax assets—long-term portion	363	355
Other long-term assets	12,701	11,074
Total assets	497,118	504,511
Current liabilities:
Accounts payable and accrued liabilities	49,321	45,534
Current portion of long-term debt	12,800	12,750
Deferred revenue—short-term portion	16,283	18,660
Total current liabilities	78,404	76,944
Deferred revenue—long-term portion	2,676	2,824
Convertible notes	105,000	105,000
Term loan—long-term portion	23,450	26,700
Other long-term liabilities	21,419	21,496
Total liabilities	230,949	232,964
Stockholders’ equity:
Common stock	727	723
Additional paid-in capital	771,474	768,149
Accumulated other comprehensive income	10,159	8,392
Accumulated deficit	(516,191)	(505,717)
Total stockholders’ equity	266,169	271,547
Total liabilities and stockholders’ equity	$ 497,118	$ 504,511