Debt (Details) - USD ($)
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3 Months Ended |
6 Months Ended |
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Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
May 31, 2016 |
Apr. 30, 2016 |
Mar. 31, 2016 |
Aug. 31, 2012 |
| Summarized information about the term loan [Abstract] |
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| Less current portion of term loan |
$ (3,064,000)
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$ (3,064,000)
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$ (3,067,000)
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| Long-term portion of term loan |
18,447,000
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18,447,000
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$ 19,980,000
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| Credit Facility [Member] |
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| Credit Facility [Abstract] |
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| Maximum borrowing capacity |
125,000,000
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$ 125,000,000
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| Debt instrument, maturity date |
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Jun. 03, 2020
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| Credit Facility [Member] | Minimum [Member] |
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| Credit Facility [Abstract] |
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| Facility fee on total leverage ratio |
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0.25%
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| Credit Facility [Member] | Maximum [Member] |
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| Credit Facility [Abstract] |
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| Dividend payments, annual maximum amount permitted |
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$ 10,000,000
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| Facility fee on total leverage ratio |
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0.375%
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| Credit Facility [Member] | LIBOR [Member] |
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| Credit Facility [Abstract] |
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| Reference interest rate under option 1, floor |
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2.50%
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| Interest rate over LIBOR rate under option 1 |
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2.75%
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| Interest rate above base rate under option 2 |
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3.00%
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| Credit Facility [Member] | Reference Rate [Member] |
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| Credit Facility [Abstract] |
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| Reference interest rate under option 1, floor |
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1.50%
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| Interest rate over LIBOR rate under option 1 |
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1.75%
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| Interest rate above base rate under option 2 |
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2.00%
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| Credit Facility [Member] | Term Loans [Member] |
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| Credit Facility [Abstract] |
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| Maximum borrowing capacity |
$ 25,000,000
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$ 25,000,000
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| Quarterly principal payments |
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$ 781,250
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| Interest rate at end of period |
3.28%
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3.28%
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2.94%
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| Summarized information about the term loan [Abstract] |
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| Principal amount of term loan |
$ 21,875,000
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$ 21,875,000
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$ 23,438,000
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| Unamortized financing fees |
(364,000)
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(364,000)
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(391,000)
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| Net carrying amount of term loan |
21,511,000
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21,511,000
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23,047,000
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| Less current portion of term loan |
(3,064,000)
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(3,064,000)
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(3,067,000)
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| Long-term portion of term loan |
18,447,000
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18,447,000
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19,980,000
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| Future repayments of the Term Loan, by fiscal year [Abstract] |
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| 2017 - remaining six months |
1,562,000
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1,562,000
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| 2018 |
3,125,000
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3,125,000
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| 2019 |
3,125,000
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3,125,000
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| 2020 |
3,125,000
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3,125,000
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| 2021 |
10,938,000
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10,938,000
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| Total payments |
$ 21,875,000
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$ 21,875,000
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$ 23,438,000
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| Credit Facility [Member] | Revolving Facility [Member] |
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| Credit Facility [Abstract] |
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| Maximum borrowing capacity |
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$ 120,000,000
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$ 100,000,000
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| Interest rate at end of period |
4.21%
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4.21%
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3.53%
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| Future repayments of the Term Loan, by fiscal year [Abstract] |
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| Outstanding balance under revolving loan |
$ 19,000,000
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$ 19,000,000
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$ 7,000,000
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| Amount available under revolving facility |
100,140,000
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100,140,000
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| Credit Facility [Member] | Revolving Facility [Member] | Letters of Credit [Member] |
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| Credit Facility [Abstract] |
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| Maximum borrowing capacity |
15,000,000
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15,000,000
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$ 15,000,000
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| Credit Facility [Member] | Revolving Facility [Member] | Commercial Letters of Credit [Member] |
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| Future repayments of the Term Loan, by fiscal year [Abstract] |
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| Outstanding balance under revolving loan |
600,000
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600,000
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| Credit Facility [Member] | Revolving Facility [Member] | Standby Letters of Credit [Member] |
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| Future repayments of the Term Loan, by fiscal year [Abstract] |
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| Outstanding balance under revolving loan |
260,000
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260,000
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| WX Agreement [Member] | Supplier Warrant [Member] |
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| WX Agreement [Abstract] |
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| Number of shares that can be purchased under warrants (in shares) |
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516,129
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| Initial exercise price (in dollars per share) |
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$ 7.75
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| Fair value of warrants issued |
10,878,000
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10,878,000
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$ 15,643,000
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| Total gain (loss) included in net loss |
$ (824,000)
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$ (600,000)
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$ 4,765,000
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$ (1,742,000)
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