Annual report pursuant to Section 13 and 15(d)

Composition of Certain Financial Statement Captions - Changes in Allowance for Doubtful Accounts, Provision for Inventory Reserve and Tax Valuation (Details)

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Composition of Certain Financial Statement Captions - Changes in Allowance for Doubtful Accounts, Provision for Inventory Reserve and Tax Valuation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts    
Allowance for doubtful accounts for inventory reserve and tax valuation    
Beginning balance $ (1,446) $ (1,671)
Charged to expense (665) (891)
Written-off 353 1,063
Charged to other 0 53
Ending balance (1,758) (1,446)
Inventory reserve    
Allowance for doubtful accounts for inventory reserve and tax valuation    
Beginning balance (6,565) (945)
Charged to expense (1,915) (5,390)
Written-off 5,524 (230)
Charged to other 0 0
Ending balance (2,956) (6,565)
Tax valuation allowance    
Allowance for doubtful accounts for inventory reserve and tax valuation    
Beginning balance (142,062) (55,415)
Charged to expense (12,854) (82,358)
Written-off 0 0
Charged to other 0 (4,289)
Ending balance $ (154,916) $ (142,062)