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Schedule II: Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Allowance for Doubtful Accounts |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | $ 205 | $ 693 | $ 1,415
Additions | 187 | 612 | 1,685
Deletions | 340 | 1,100 | 2,677
Adjustments |  |  | 270
Balance at End of Year | 52 | 205 | 693
Allowance for Sales Returns |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 1,163 | 890 | 904
Additions | 10,299 | 17,036 | 15,834
Deletions | 10,720 | 16,763 | 15,848
Balance at End of Year | 742 | 1,163 | 890
Allowance for Rental Revenue Adjustments |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 411 | 438 | 947
Additions | 2,579 | 1,762 | 2,678
Deletions | 2,594 | 1,789 | 2,917
Adjustments |  |  | (270)
Balance at End of Year | 396 | 411 | 438
Allowance for Rental Asset Loss |  |  |
Valuation And Qualifying Accounts Disclosure [Line Items] |  |  |
Balance at Beginning of Year | 395 | 594 | 754
Additions | 559 | 188 | 408
Deletions | 379 | 387 | 568
Balance at End of Year | $ 575 | $ 395 | $ 594

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