Annual report pursuant to Section 13 and 15(d)

Acquisitions - Pro Forma Information High Power Acquisition (Details)

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Acquisitions - Pro Forma Information High Power Acquisition (Details) - Higher Power - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Revenues $ 93,379 $ 220,281 $ 39,571
Net income (33,195) (5,868) 5,127
Depreciation 10,500 7,100 2,000
Revenues   42,343  
Net income (loss)   5,004  
Intercompany elimination      
Business Acquisition [Line Items]      
Revenues $ 26,500 $ 191,200 $ 27,400