Net Loss per Common Share (Detail) - USD ($) $ / shares in Units, $ in Thousands |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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 |
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| Earnings Per Share [Abstract] | |||||||||||
| Net loss from operations, net of taxes | $ (4,212) | $ (4,795) | $ (6,603) | $ (4,087) | $ (5,780) | $ (868) | $ (5,775) | $ (6,715) | $ (19,697) | $ (19,138) | $ (24,492) |
| Weighted average common shares outstanding, basic and diluted (in shares) | 75,160,000 | 72,148,000 | 66,846,000 | 66,599,000 | 66,595,000 | 66,634,000 | 66,457,000 | 66,286,000 | 70,263,000 | 66,511,000 | 61,763,000 |
| Basic and diluted net loss per common share from continuing operations (in dollars per share) | $ (0.06) | $ (0.06) | $ (0.10) | $ (0.06) | $ (0.09) | $ (0.01) | $ (0.09) | $ (0.10) | $ (0.28) | $ (0.29) | $ (0.40) |
| Common stock equivalents excluded from net loss per diluted share because their effect would have been anti-dilutive (in shares) | 2,572,147 | 825,675 | 1,438,355 | ||||||||
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount after tax of income (loss) from continuing operations attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition The amount of net income (loss) from continuing operations per each basic and diluted share of common stock or unit when the per share amount is the same for both basic and diluted shares. No definition available.
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| X | ||||||||||
- Definition The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Average number of shares or units issued and outstanding that are used in calculating basic and diluted earnings per share (EPS). No definition available.
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