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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Data [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited)
| First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Total
| (in thousands, except per share data)
2015 |  |  |  |  |  |  |  |  |
Revenue | $ | 82,373 |  |  | $ | 87,030 |  |  | $ | 87,942 |  |  | $ | 77,014 |  |  | $ | 334,359 |
Gross margin | 26,527 |  |  | 29,252 |  |  | 31,227 |  |  | 28,104 |  |  | 115,110 |
Net income (loss) | (1,515 | ) |  | (12,547 | ) |  | 1,975 |  |  | (1,375 | ) |  | (13,462 | )
Earnings (loss) per share(1): |  |  |  |  |  |  |  |  |
Basic | $ | (0.03 | ) |  | $ | (0.23 | ) |  | $ | 0.04 |  |  | $ | (0.03 | ) |  | $ | (0.25 | )
Diluted | $ | (0.03 | ) |  | $ | (0.23 | ) |  | $ | 0.04 |  |  | $ | (0.03 | ) |  | $ | (0.25 | )
2014 |  |  |  |  |  |  |  |  |
Revenue | $ | 102,575 |  |  | $ | 105,318 |  |  | $ | 116,761 |  |  | $ | 124,503 |  |  | $ | 449,157 |
Gross margin | 43,681 |  |  | 42,310 |  |  | 46,078 |  |  | 50,890 |  |  | 182,959 |
Net income | 12,018 |  |  | 11,041 |  |  | 14,272 |  |  | 16,272 |  |  | 53,603 |
Earnings per share(1): |  |  |  |  |  |  |  |  |
Basic | $ | 0.22 |  |  | $ | 0.20 |  |  | $ | 0.26 |  |  | $ | 0.30 |  |  | $ | 0.98 |
Diluted | $ | 0.22 |  |  | $ | 0.20 |  |  | $ | 0.26 |  |  | $ | 0.29 |  |  | $ | 0.97 |
(1) The sum of the quarterly earnings (loss) per share (basic and diluted) may not agree to the earnings (loss) per share for the year due to the timing of common stock issuances.

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- Definition The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e765-108305 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=51825399&loc=d3e1280-108306 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=51655806&loc=d3e725-108305 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section G -Subsection 1 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 302 -Paragraph a + Details
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