XML 63 R49.htm IDEA: XBRL DOCUMENT v3.3.1.900
Stock-Based Compensation and Employee Benefit Plans - Summary of the Activity under the 2000 Plan (Detail) - Vicor Plan [Member] - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Options Outstanding, Beginning balance   1,895,675  
Options Outstanding, Granted   194,561  
Options Outstanding, Forfeited and expired   (117,085)  
Options Outstanding, Exercised   (125,084)  
Options Outstanding, Ending balance 1,895,675 1,848,067  
Options Outstanding, Exercisable 306,173 565,861 54,284
Options Outstanding, Vested or expected to vest   1,778,075  
Weighted Average Exercise Price, Beginning balance   $ 8.07  
Weighted Average Exercise Price, Granted   12.51  
Weighted Average Exercise Price, Forfeited and expired   9.30  
Weighted Average Exercise Price, Exercised   6.44  
Weighted Average Exercise Price, Ending balance $ 8.07 8.57  
Weighted Average Exercise Price, Exercisable $ 6.90 7.24 $ 9.72
Weighted Average Exercise Price, Vested or expected to vest   $ 8.51  
Weighted-Average Remaining Contractual Life in Years, Outstanding   7 years 7 months 21 days  
Weighted-Average Remaining Contractual Life in Years, Exercisable   7 years 3 months  
Weighted-Average Remaining Contractual Life in Years, Vested or expected to vest   7 years 7 months 21 days  
Aggregate Intrinsic Value, Outstanding   $ 2,637  
Aggregate Intrinsic Value, Exercisable   1,269  
Aggregate Intrinsic Value, Vested or expected to vest   $ 2,580