Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Current assets:
Cash and cash equivalents	$ 69,779	$ 49,279	$ 46,604
Accounts receivable, less allowance of $331 in 2011 and $309 in 2010	34,484	38,825
Inventories, net	36,177	35,489
Deferred tax assets	2,527	2,164
Other current assets	3,641	2,397
Total current assets	146,608	128,154
Long-term investments, net	11,721	18,417
Property, plant and equipment, net	50,456	50,848
Long-term deferred tax assets, net	1,780	2,805
Other assets	4,535	4,688
Total assets	215,100	204,912
Current liabilities:
Accounts payable	11,619	11,999
Accrued compensation and benefits	7,273	6,772
Accrued expenses	3,132	3,138
Income taxes payable	251	102
Deferred revenue	741	689
Total current liabilities	23,016	22,700
Long-term deferred revenue	2,411	2,178
Long-term income taxes payable	1,058	1,022
Commitments and contingencies (Note 11)
Vicor Corporation stockholders' equity:
Common Stock	386	385
Additional paid-in capital	165,234	163,933
Retained earnings	140,875	133,791
Accumulated other comprehensive loss	(437)	(1,369)
Treasury stock, at cost	(121,827)	(121,827)
Total Vicor Corporation stockholders' equity	184,349	175,031
Noncontrolling interest	4,266	3,981
Total equity	188,615	179,012
Total liabilities and equity	215,100	204,912
Common Class B [Member]
Vicor Corporation stockholders' equity:
Common Stock	$ 118	$ 118