Unaudited Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Dec. 31, 2016 |
Sep. 30, 2016 |
Jun. 30, 2016 |
Mar. 31, 2016 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Revenue: | |||||||||||
| Sales of fuel cell systems and related infrastructure | $ 19,993 | $ 5,653 | $ 9,121 | $ 5,218 | $ 29,472 | $ 24,777 | $ 18,663 | $ 5,090 | $ 39,985 | $ 78,002 | $ 48,306 |
| Services performed on fuel cell systems and related infrastructure | 5,060 | 4,763 | 5,360 | 5,273 | 4,929 | 3,555 | 2,883 | 2,645 | 20,456 | 14,012 | 9,909 |
| Sales Revenue, Services, Net | 4,061 | 3,858 | 3,062 | 2,706 | 2,118 | 1,546 | 1,077 | 977 | 13,687 | 5,718 | 2,137 |
| Fuel delivered to customers | 3,359 | 2,909 | 2,638 | 2,010 | 1,744 | 1,544 | 1,128 | 659 | 10,916 | 5,075 | 1,959 |
| Other | 105 | 376 | 278 | 125 | 168 | 10 | 258 | 45 | 884 | 481 | 1,919 |
| Gross (loss) profit | 3,011 | 381 | 384 | 170 | (9,417) | 76 | 1,562 | (2,111) | 3,946 | (9,890) | (4,862) |
| Operating expenses | 14,948 | 13,637 | 13,760 | 13,120 | 14,703 | 12,332 | 11,427 | 10,650 | 55,465 | 49,112 | 33,070 |
| Operating loss | (11,937) | (13,256) | (13,376) | (12,950) | (24,120) | (12,256) | (9,865) | (12,761) | (51,519) | (59,002) | (37,932) |
| Net loss attributable to common shareholders | $ (19,237) | $ (13,420) | $ (13,154) | $ (11,780) | $ (25,227) | $ (10,238) | $ (9,253) | $ (11,077) | $ (57,591) | $ (55,795) | $ (88,644) |
| (Loss) income per share: | |||||||||||
| Basic and diluted (in dollars per share) | $ (0.11) | $ (0.07) | $ (0.07) | $ (0.07) | $ (0.14) | $ (0.06) | $ (0.05) | $ (0.06) | $ (0.32) | $ (0.32) | $ (0.56) |
| Provision | $ 1,100 | $ 10,100 | $ 1,071 | $ (10,050) | |||||||