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Schedule II: Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for Doubtful Accounts |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 693 | $ 1,415 | $ 1,869
Additions | 612 | 1,685 | 3,864
Deletions | 1,100 | 2,677 | 4,418
Adjustments |  | 270 | 100
Balance at End of Year | 205 | 693 | 1,415
Allowance for Sales Returns |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 890 | 904 | 585
Additions | 17,036 | 15,834 | 9,909
Deletions | 16,763 | 15,848 | 9,590
Balance at End of Year | 1,163 | 890 | 904
Allowance for Rental Revenue Adjustments |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 438 | 947 | 6,078
Additions | 1,762 | 2,678 | 5,057
Deletions | 1,789 | 2,917 | 10,088
Adjustments |  | (270) | (100)
Balance at End of Year | 411 | 438 | 947
Allowance for Rental Asset Loss |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 594 | 754 | 725
Additions | 188 | 408 | 561
Deletions | 387 | 568 | 532
Balance at End of Year | $ 395 | $ 594 | $ 754

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