CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS
Net sales	$ 236,984	$ 181,278	$ 159,254
Cost of sales	38,588	25,075	21,050
Gross profit	198,396	156,203	138,204
Operating expenses:
Selling, general and administrative	176,635	119,529	96,260
Research and development	68,308	49,676	38,905
In-process research and development	3,745		5,320
Total operating expenses	248,688	169,205	140,485
Loss from operations	(50,292)	(13,002)	(2,281)
Non-operating income (expense)
Interest income	3,169	2,252	1,375
Interest expense	(2,565)
Other (expense) income, net	(348)	(1,618)	907
Total non-operating income	256	634	2,282
(Loss) income before taxes	(50,036)	(12,368)	1
Income tax (benefit) provision	(65,460)	583	93
Net income (loss)	$ 15,424	$ (12,951)	$ (92)
Basic net income (loss) per share (in dollar per share)	$ 0.41	$ (0.37)	$ 0.00
Diluted net income (loss) per share (in dollar per share)	$ 0.37	$ (0.37)	$ 0.00
Weighted average shares used to compute basic net income (loss) per share	37,355	35,317	34,381
Weighted average shares used to compute diluted net loss per share	41,145	35,317	34,381

The net amount of interest expense and other nonoperating expenses.

No definition available.

Name:	gkos_InterestAndOtherExpenseNet
Namespace Prefix:	gkos_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227