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Quarterly Results of Operations (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial information
Unaudited
 
Three Months Ended
2017
 
March 31,
 
June 30,
 
September 30,
 
December 31,
Revenue
 
$
6,139

 
$
9,934

 
$
12,715

 
$
15,011

Gross profit
 
5,375

 
9,017

 
11,951

 
14,008

Loss from continuing operations, net of income taxes
 
(9,561
)
 
(6,803
)
 
(3,273
)
 
(63
)
Total income (loss) from discontinued operations, net of income taxes
 
2,701

 
4,503

 
15,567

 
(844
)
Net income (loss)
 
$
(6,860
)
 
$
(2,300
)
 
$
12,294

 
$
(907
)
Net earnings (loss) per share - basic and diluted:
 
 
 
 
 
 
 
 
Loss from continuing operations, net of income taxes(1)
 
$
(0.19
)
 
$
(0.14
)
 
$
(0.06
)
 
$
—

Income (loss) from discontinued operations, net of income taxes(1)
 
0.05

 
0.09

 
0.30

 
(0.02
)
Net income (loss)(1)
 
$
(0.14
)
 
$
(0.05
)
 
$
0.24

 
$
(0.02
)
 
 
 
 
 
 
 
 
 
Basic and diluted weighted-average number of shares outstanding(2)
 
49,998,547

 
50,205,913

 
50,642,344

 
51,195,402

 
 
 
 
 
 
 
 
 

Unaudited
 
Three Months Ended
2016
 
March 31,
 
June 30,
 
September 30,
 
December 31,
Revenue
 
$
5,409

 
$
5,702

 
$
7,633

 
$
10,377

Gross profit
 
4,883

 
5,296

 
7,123

 
9,608

Loss from continuing operations, net of income taxes
 
(9,944
)
 
(6,698
)
 
(4,114
)
 
(3,094
)
Total income (loss) from discontinued operations, net of income taxes
 
(1,130
)
 
843

 
497

 
2,693

Net loss
 
(11,074
)
 
(5,855
)
 
(3,617
)
 
(401
)
Net earnings (loss) per share - basic and diluted:
 
 
 
 
 
 
 
 
Loss from continuing operations, net of income taxes(1)
 
(0.19
)
 
(0.13
)
 
(0.08
)
 
(0.06
)
Income (loss) from discontinued operations, net of income taxes(1)
 
(0.02
)
 
0.02

 
0.01

 
0.05

Net loss(1)
 
$
(0.21
)
 
$
(0.11
)
 
$
(0.07
)
 
$
(0.01
)
 
 
 
 
 
 
 
 
 
Basic and diluted weighted-average number of shares outstanding(2)
 
52,372,857

 
52,633,054

 
52,473,601

 
51,644,295

 
 
 
 
 
 
 
 
 
(1)
Basic and diluted loss from continuing operations, net of income taxes; income (loss) from discontinued operations, net of income taxes and net income (loss) is computed independently for each of the quarters presented.  Therefore, the sum of all quarterly basic and diluted loss from continuing operations, net of income taxes; income (loss) discontinued operations, net of income taxes and net income (loss) per share may not equal the annual basic and diluted earnings (loss) per share calculations. 
(2)
Due to the Company’s losses from loss from continuing operations, net of income taxes, all potentially dilutive securities are anti-dilutive and, therefore, basic and diluted weighted average common shares outstanding are equal for all periods presented.