Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 4,558	$ 7,298
Short-term investments	38,988	48,987
Accounts and other receivables (net of allowances for doubtful accounts of: $134 and $21, respectively)	1,878	1,487
Inventories	141	423
Deferred income taxes	165	215
Prepaid expenses and other current assets	706	479
Total current assets	46,436	58,889
Property and equipment, net	1,281	1,737
Intangibles and other assets, net	15,725	14,053
Total assets	63,442	74,679
Current liabilities:
Accounts payable	338	365
Accrued compensation	2,502	2,830
Other current liabilities	1,022	2,054
Deferred revenue and customer advances	3,934	4,120
Total current liabilities	7,796	9,369
Long-term deferred revenue	10,221	13,229
Deferred income tax liabilities	165	215
Other long-term liabilities	619	245
Total liabilities	18,801	23,058
Commitments and contingencies (Notes 9 and 15)
Stockholders' equity:
Common stock and additional paid-in capital - $0.001 par value; 100,000,000 shares authorized; 32,278,330 and 31,786,030 shares issued, respectively; 27,295,586 and 27,857,824 shares outstanding, respectively	186,822	182,508
Accumulated other comprehensive income	109	118
Accumulated deficit	(111,721)	(106,157)
Treasury stock at cost: 4,982,744 and 3,928,206 shares, respectively	(30,569)	(24,848)
Total stockholders' equity	44,641	51,621
Total liabilities and stockholders' equity	$ 63,442	$ 74,679