Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001558370-16-009972-index-headers.html | 2016-11-10 20:30:21 | |
| 0001558370-16-009972-index.html | 2016-11-10 20:30:21 | |
| 0001558370-16-009972.txt | 2016-11-10 20:30:21 | |
 0001558370-16-009972-xbrl.zip | 155227 | 2016-11-10 20:30:21 |
| FilingSummary.xml | 31634 | 2016-11-10 20:30:21 |
| Financial_Report.xlsx | 75137 | 2016-11-10 20:30:21 |
| ntra-20160930.xml | 2049130 | 2016-11-10 20:30:21 |
| ntra-20160930.xsd | 38250 | 2016-11-10 20:30:21 |
| ntra-20160930ex101a3cbcb.htm | 214500 | 2016-11-10 20:30:21 |
| ntra-20160930ex311810103.htm | 20521 | 2016-11-10 20:30:21 |
| ntra-20160930ex31239cf31.htm | 22081 | 2016-11-10 20:30:21 |
| ntra-20160930ex321ea101d.htm | 14198 | 2016-11-10 20:30:21 |
| ntra-20160930ex322e37f56.htm | 12628 | 2016-11-10 20:30:21 |
| ntra-20160930x10q.htm | 2225218 | 2016-11-10 20:30:21 |
| ntra-20160930_cal.xml | 62103 | 2016-11-10 20:30:21 |
| ntra-20160930_def.xml | 195711 | 2016-11-10 20:30:21 |
| ntra-20160930_lab.xml | 493448 | 2016-11-10 20:30:21 |
| ntra-20160930_pre.xml | 358904 | 2016-11-10 20:30:21 |
 ntra20160930ex101a3cbcb001.jpg | 37675 | 2016-11-10 20:30:21 |
 ntra20160930ex101a3cbcb002.jpg | 34151 | 2016-11-10 20:30:21 |
 ntra20160930ex101a3cbcb003.jpg | 36072 | 2016-11-10 20:30:21 |
 ntra20160930ex101a3cbcb004.jpg | 39765 | 2016-11-10 20:30:21 |
 ntra20160930ex101a3cbcb005.jpg | 33243 | 2016-11-10 20:30:21 |
| R1.htm | 22210 | 2016-11-10 20:30:21 |
| R10.htm | 99896 | 2016-11-10 20:30:21 |
| R11.htm | 40786 | 2016-11-10 20:30:21 |
| R12.htm | 255829 | 2016-11-10 20:30:21 |
| R13.htm | 6101 | 2016-11-10 20:30:21 |
| R14.htm | 4686 | 2016-11-10 20:30:21 |
| R15.htm | 8801 | 2016-11-10 20:30:21 |
| R16.htm | 90538 | 2016-11-10 20:30:21 |
| R17.htm | 51340 | 2016-11-10 20:30:21 |
| R18.htm | 7278 | 2016-11-10 20:30:21 |
| R19.htm | 104822 | 2016-11-10 20:30:21 |
| R2.htm | 73590 | 2016-11-10 20:30:21 |
| R20.htm | 30609 | 2016-11-10 20:30:21 |
| R21.htm | 128059 | 2016-11-10 20:30:21 |
| R22.htm | 133072 | 2016-11-10 20:30:21 |
| R23.htm | 99525 | 2016-11-10 20:30:21 |
| R24.htm | 23950 | 2016-11-10 20:30:21 |
| R25.htm | 250771 | 2016-11-10 20:30:21 |
| R26.htm | 89634 | 2016-11-10 20:30:21 |
| R27.htm | 47245 | 2016-11-10 20:30:21 |
| R28.htm | 4705 | 2016-11-10 20:30:21 |
| R29.htm | 13217 | 2016-11-10 20:30:21 |
| R3.htm | 4731 | 2016-11-10 20:30:21 |
| R30.htm | 14174 | 2016-11-10 20:30:21 |
| R31.htm | 8018 | 2016-11-10 20:30:21 |
| R32.htm | 18784 | 2016-11-10 20:30:21 |
| R33.htm | 17373 | 2016-11-10 20:30:21 |
| R34.htm | 39633 | 2016-11-10 20:30:21 |
| R35.htm | 11345 | 2016-11-10 20:30:21 |
| R36.htm | 58248 | 2016-11-10 20:30:21 |
| R37.htm | 44962 | 2016-11-10 20:30:21 |
| R38.htm | 12883 | 2016-11-10 20:30:21 |
| R39.htm | 22246 | 2016-11-10 20:30:21 |
| R4.htm | 46858 | 2016-11-10 20:30:21 |
| R40.htm | 58201 | 2016-11-10 20:30:21 |
| R41.htm | 19844 | 2016-11-10 20:30:21 |
| R42.htm | 46602 | 2016-11-10 20:30:21 |
| R43.htm | 54247 | 2016-11-10 20:30:21 |
| R44.htm | 25122 | 2016-11-10 20:30:21 |
| R45.htm | 34671 | 2016-11-10 20:30:21 |
| R46.htm | 20683 | 2016-11-10 20:30:21 |
| R47.htm | 39226 | 2016-11-10 20:30:21 |
| R48.htm | 7431 | 2016-11-10 20:30:21 |
| R49.htm | 11731 | 2016-11-10 20:30:21 |
| R5.htm | 98663 | 2016-11-10 20:30:21 |
| R50.htm | 16210 | 2016-11-10 20:30:21 |
| R51.htm | 18044 | 2016-11-10 20:30:21 |
| R52.htm | 14337 | 2016-11-10 20:30:21 |
| R53.htm | 22482 | 2016-11-10 20:30:21 |
| R6.htm | 8233 | 2016-11-10 20:30:21 |
| R7.htm | 68159 | 2016-11-10 20:30:21 |
| R8.htm | 136885 | 2016-11-10 20:30:21 |
| R9.htm | 133560 | 2016-11-10 20:30:21 |
| report.css | 2767 | 2016-11-10 20:30:21 |
| Show.js | 1410 | 2016-11-10 20:30:21 |