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Income Taxes (Reconciliation of Taxes Provided to Federal Statutory Rate) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Income Taxes Reconciliation Of Taxes Provided To Federal Statutory Rate Details |  |  |  |  |  |  |  |  |  |  |
Tax provision at statutory rate |  |  |  |  |  |  |  |  | $ (11,790) | $ (1,652) | $ (2,029)
State income taxes before valuation allowance, net of federal effect |  |  |  |  |  |  |  |  | (1,042) | 108 | 9
Foreign tax rate differential |  |  |  |  |  |  |  |  | (1,188) | 885 | (769)
Research and development credits |  |  |  |  |  |  |  |  | (2,189) | (1,484) | (1,253)
Change in valuation allowance |  |  |  |  |  |  |  |  | 56,663 | (287) | (1,555)
Compensation/option differences |  |  |  |  |  |  |  |  | (4,965) | (246) | (471)
Tax Act rate change impact |  |  |  |  |  |  |  |  | 1,132 | 0 | 0
Non-deductible compensation |  |  |  |  |  |  |  |  | 22,630 | 1,079 | 944
Acquisition costs |  |  |  |  |  |  |  |  | 0 | 54 | 230
Expiring California loss carry-forwards |  |  |  |  |  |  |  |  | 0 | 0 | 1,626
Foreign loss not benefited |  |  |  |  |  |  |  |  | 6,847 | 780 | 2,342
Other |  |  |  |  |  |  |  |  | 196 | 637 | 79
Total income tax provision (benefit) | $ 142 | $ 70,842 | $ (3,453) | $ (1,236) | $ (178) | $ 30 | $ (15) | $ 37 | $ 66,294 | $ (126) | $ (847)

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to expiring state net operating loss tax expense (benefit). + References No definition available. + Details
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- Definition Amount of current and deferred foreign income tax expense (benefit) attributable to income (loss) from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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