Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 68,206	$ 44,230
Accounts receivable, less allowance of $252 in 2018 and $159 in 2017	45,052	34,487
Inventories, net	43,444	36,499
Other current assets	3,900	3,616
Total current assets	160,602	118,832
Long-term deferred tax assets, net	184	210
Long-term investments, net	2,613	2,525
Property, plant and equipment, net	41,465	41,356
Other assets	2,801	2,801
Total assets	207,665	165,724
Current liabilities:
Accounts payable	13,106	9,065
Accrued compensation and benefits	9,159	9,891
Accrued expenses	2,384	2,989
Sales allowances	567
Accrued severance and other charges	325
Income taxes payable	708	300
Deferred revenue	4,442	5,791
Total current liabilities	30,691	28,036
Long-term deferred revenue	249	303
Contingent consideration obligations	470	678
Long-term income taxes payable	195	195
Other long-term liabilities	100	93
Total liabilities	31,705	29,305
Commitments and contingencies (Note 12)
Vicor Corporation stockholders' equity:
Additional paid-in capital	192,373	181,395
Retained earnings	122,090	93,605
Accumulated other comprehensive loss	(516)	(478)
Treasury stock, at cost	(138,927)	(138,927)
Total Vicor Corporation stockholders' equity	175,540	136,114
Noncontrolling interest	420	305
Total equity	175,960	136,419
Total liabilities and equity	207,665	165,724
Class B Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	118	118
Common Stock [Member]
Vicor Corporation stockholders' equity:
Common Stock	$ 402	$ 401