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Selected Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2017
Selected Quarterly Financial Data [Abstract] |
Selected Quarterly Financial Data (Unaudited) | 1 6. SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  | For the Three Months Ended
﻿ |  | March 31, |  | June 30, |  | September 30, |  | December 31,
﻿ |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
﻿Operating Results: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
﻿Revenue |  | $ | 41,273 |  | $ | 35,940 |  | $ | 45,231 |  | $ | 39,672 |  | $ | 42,150 |  | $ | 38,340 |  | $ | 46,062 |  | $ | 41,157
﻿Gross profit |  |  | 30,008 |  |  | 25,914 |  |  | 32,554 |  |  | 28,818 |  |  | 30,918 |  |  | 27,472 |  |  | 32,683 |  |  | 28,897
﻿Loss from operations |  |  | (9,642) |  |  | (9,419) |  |  | (6,355) |  |  | (7,738) |  |  | (6,847) |  |  | (6,286) |  |  | (2,135) |  |  | (7,695)
﻿Net loss |  |  | (10,183) |  |  | (9,724) |  |  | (6,883) |  |  | (8,206) |  |  | (7,246) |  |  | (6,783) |  |  | (2,580) |  |  | (8,625)
﻿Net loss per share (basic and diluted) |  | $ | (0.32) |  | $ | (0.31) |  | $ | (0.21) |  | $ | (0.26) |  | $ | (0.22) |  | $ | (0.21) |  | $ | (0.08) |  | $ | (0.27)
﻿ Amounts may not sum to consolidated totals for the full year due to rounding. Basic and diluted net loss per share is computed independently for each of the quarters presented. Therefore, the sum of the quarterly per share amounts will not necessarily equal the total for the year.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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