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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 29, 2019 | Jan. 31, 2020 | Oct. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2016 | Dec. 31, 2019
Concentration Risk [Line Items] |  |  |  |  |  |  |
Class Of Warrant Or Right, Warrants Issued |  |  |  | 3,682,729 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 0.125 |  |  |
Amount paid for clearing fees |  | $ 231 |  |  |  |  |
Offering Costs |  |  |  | $ 474 |  |  |
Proceeds from the Issuance of Common Stock and Warrants, Net of Issuance Costs |  |  |  | $ 2,300 |  |  |
Debt Instrument, Proceeds To Be Paid To Lender, Percent |  |  |  | 10.00% |  |  |
Proceeds from Issuance or Sale of Equity |  |  |  | $ 275 |  |  |
Payments on the Iliad Note |  |  |  | 226 | $ 0 |  |
Note Purchase Agreement [Member] |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Debt Instrument, Proceeds To Be Paid To Lender, Percent | 10.00% |  |  |  |  |  |
Payments on the Iliad Note |  |  |  | $ 226 |  |  |
Institutional Investor [Member] |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Class Of Warrant Or Right, Warrants Issued |  |  |  | 3,441,803 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 0.674 |  |  |
Private Placement [Member] |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Class Of Warrant Or Right, Warrants Issued |  |  |  | 240,926 |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  | $ 0.9988 |  |  |
Amount paid for placement agent commissions |  | 193 |  |  |  |  |
Amount paid related to expenses for registered direct offering and concurrent private placement |  | $ 50 |  |  |  |  |
All Other Products |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Warranty service periods |  |  | 5 years |  |  |  |
LEDFL Tubular LED Lamps (Excluding Red Caps) |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Warranty service periods |  |  | 10 years |  |  |  |
Minimum |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Warranty service periods |  |  |  |  |  | 1 year |
Maximum |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Warranty service periods |  |  |  |  |  | 5 years |
Maximum | Commercial LEDFL Tubular LED Lamps (Excluding Battery Backup TLED), Troffer Luminaires, And Certain Globe Lights |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Warranty service periods |  |  |  |  |  | 10 years |
Customer concentration risk |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  | 10.00% |  |  |
Revenue | Geographic concentration risk | Countries outside of the United States |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  | 1.00% |  |  |
Distributor To The U.S. Navy | Revenue | Customer concentration risk |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  | 38.00% | 22.00% |  |
Distributor To The U.S. Navy | Accounts receivable | Customer concentration risk |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  | 44.00% |  |  | 10.00%
Distributor for the U.S. Navy and a Regional Commercial Lighting Retrofit Company [Member] | Revenue | Customer concentration risk |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  | 15.00% | 30.00% |  |
Distributor for the U.S. Navy and a Regional Commercial Lighting Retrofit Company [Member] | Accounts receivable | Customer concentration risk |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  | 12.00% |  |  | 41.00%
U.S. Navy and Shipbuilders [Member] | Revenue | Customer concentration risk |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  | 46.00% | 32.00% |  |

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