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Impact on Previously Issued Financial Statements for the Correction of an Error, Revised Consolidated Statement of Comprehensive Income (Loss) (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2018
Consolidated Statement of Comprehensive Income [Abstract] |  |  |  |  |
Net income (loss) | $ (3,102,000) | $ (2,527,000) | $ (5,084,000) | $ 10,888,000 |
Comprehensive income (loss) | $ (3,404,000) | (2,197,000) | $ (6,103,000) | 12,171,000 |
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] |  |  |  |  |
Consolidated Statement of Comprehensive Income [Abstract] |  |  |  |  |
Net income (loss) |  | (2,650,000) |  | 10,368,000 | $ 18,826,000
Comprehensive income (loss) |  | (2,320,000) |  | 11,651,000 | 20,839,000
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | As Previously Reported [Member] |  |  |  |  |
Consolidated Statement of Comprehensive Income [Abstract] |  |  |  |  |
Net income (loss) |  | (6,806,000) |  | 7,121,000 | 16,316,000
Comprehensive income (loss) |  | (6,476,000) |  | 8,404,000 | 18,329,000
Historical Misapplication of GAAP Related to Timing of Recognizing Certain Expenses Incurred in Connection with New Business [Member] | Adjustment [Member] |  |  |  |  |
Consolidated Statement of Comprehensive Income [Abstract] |  |  |  |  |
Net income (loss) |  | 4,156,000 |  | 3,247,000 | 2,510,000
Comprehensive income (loss) |  | $ 4,156,000 |  | $ 3,247,000 | $ 2,510,000

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