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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($) shares in Thousands, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 01, 2016 | Feb. 27, 2012 | Jun. 30, 2016 | Mar. 31, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in accounts payable |  |  |  |  |  | $ 176 | $ (2,583) |
Increase (decrease) in net inventory |  |  |  |  |  | 6,771 | 3,788 |
Net sales |  |  | $ 7,126 |  | $ 16,232 | $ 15,551 | 28,819 |
Securities excluded from net loss per share calculation (in shares) |  |  | 146 |  |  | 183 |  |
Warranty service periods | 10 years |  |  |  |  |  |  |
Interest expense |  |  | $ 0 |  | 26 | $ 0 | 49 |
Communal |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Recorded expenses under agreement |  |  |  |  | $ 56 |  | $ 113 |
Chief Executive Officer |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Ownership interest |  | 50.00% |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Warranty service periods |  |  |  | 1 year |  |  |  |
Maximum |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Warranty service periods |  |  |  | 5 years |  |  |  |
Immediate family member of management |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Ownership interest |  | 50.00% |  |  |  |  |  |
Geographic concentration risk | United States |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  |  |  | 99.00% |  |
Revenue | Customer concentration risk |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  | 11.00% |  |  | 11.00% |  |
Revenue | Customer concentration risk | LED Lighting Solutions Global, LLC |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  |  | 79.00% |  | 82.00% |
Revenue | Product concentration risk |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  |  |  | 38.00% |  |
Revenue | Geographic concentration risk | Countries outside of the United States |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  | 1.00% |  | 1.00% | 3.00% | 1.00% |
Atlantic Diving Supply, Inc. | Revenue | Customer concentration risk |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  | 36.00% |  |  | 27.00% |  |
Atlantic Diving Supply, Inc. | Accounts receivable | Customer concentration risk |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  |  |  | 64.00% |  | 62.00%
DFAS Columbus | Revenue | Customer concentration risk |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Concentration risk (less than for one percent) |  |  |  |  |  | 11.00% |  |
U.S. Navy |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  | $ 1,600 |  | $ 3,200
Finished products |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in revenue |  |  | $ (814) |  |  |  |  |
Increase (decrease) in accounts payable |  |  | 814 |  |  |  |  |
Increase (decrease) in net inventory |  |  | 221 |  |  |  |  |
Increase (decrease) in cost of sales |  |  | (221) |  |  |  |  |
Increase (decrease) in net income |  |  | $ (593) |  |  |  |  |

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