FINANCIAL INFORMATION Revised Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 23,049	$ 48,203	$ 56,104	$ 70,390
Accounts receivable	49,263	56,770
Inventories	54,698	60,122
Deferred tax assets, net	532	522
Prepaid expenses	8,296	7,778
Other current assets	14,796	17,493
Total current assets	150,634	190,888
Property and equipment, net	33,270	35,186
Intangible assets, net	3,232	4,260
Other assets	2,360	2,393
Total assets	191,927	235,142
Current liabilities:
Accounts payable	28,335	33,990
Accrued compensation and benefits	26,416	30,342
Accrued expenses and other current liabilities	30,883	41,273
Income taxes payable	6,228	6,875
Deferred revenues	204,291	211,403
Total current liabilities	301,153	323,897
Long-term liabilities	13,937	14,586
Total liabilities	541,312	594,477
Stockholders' equity:
Common stock	423	423
Additional paid-in capital	1,045,777	1,043,384
Accumulated deficit	(1,330,969)	(1,336,526)
Treasury stock at cost, net of reissuances	(71,679)	(72,543)
Accumulated other comprehensive income	7,063	5,927
Total stockholders' equity	(349,385)	(359,335)
Total liabilities and stockholders' equity	$ 191,927	$ 235,142