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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block]
The following table presents the number of awards outstanding for each award type as of December 31, 2018 and 2017 (in thousands): 
 
Year Ended December 31,
Award type
2018
 
2017
Stock options
—

 
135

Restricted stock units (time-based)
1,969

 
2,133

Restricted stock units (market-based)
215

 
345

Stock appreciation rights
287

 
356

Market stock units
419

 
387
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
The Company applied Topic 606 using the modified retrospective method by recognizing the cumulative effect of initially applying Topic 606 as an adjustment to the opening balance sheet at January 1, 2018. Therefore, the comparative information has not been adjusted and continues to be reported under Topic 605. The differences between amounts reported under Topic 606 and what would have been reported Topic 605 are detailed below:
 
December 31, 2018
(in thousands)
As Reported
 
Adjustments
 
Balances Under Topic 605
Balance Sheets
 
 
 
 
 
Trade and other receivables, net of allowance
$
41,822

 
$
(232
)
 
$
41,590

Deferred costs, current
4,089

 
(30
)
 
4,059

Deferred costs, noncurrent
13,373

 
(8,278
)
 
5,095

Deferred revenue, current
99,262

 
2,120

 
101,382

Deferred revenue, noncurrent
17,903

 
1,088

 
18,991

Accumulated deficit
$
(292,708
)
 
$
(11,748
)
 
$
(304,456
)

 
Year Ended December 31, 2018
(in thousands, except per share amounts)
As Reported
 
Adjustments
 
Balances Under Topic 605
Income Statements
 
 
 
 
 
Total revenue
$
197,024

 
$
(761
)
 
$
196,263

Total cost of revenue
77,179

 
369

 
77,548

Selling and marketing
72,006

 
1,453

 
73,459

General and administrative
41,302

 
(318
)
 
40,984

Research and development
55,657

 
(234
)
 
55,423

Net loss
(64,246
)
 
(2,031
)
 
(66,277
)
Basic and diluted loss per share
$
(1.86
)
 
$
(0.06
)
 
$
(1.92
)